[thaumasiotes]

Well, interestingly, the problem here isn't quite that people are giving the movie false reviews. They might genuinely hate when this sort of thing happens -- bitter fights over terminology aren't particularly rare. The "problem" here is that they care more about the movie than do the general population of movie-watchers; if everyone on earth had to watch Gunday and rate it on imdb, all of these people might honestly rate it 1, but they would all be swamped by reviews from people who thought it was decent (and that group would likely be swamped by other 1-star reviews from people who didn't speak the language, but try not to focus on them).

It's similar to the problem of an author's "best" or most notable works getting lower crowd-sourced reviews than their average work. What happens there is that generally people only bother to read, and subsequently review, books that they think there's a good chance they'll like. If you're a mediocre author putting out filler in your genre, your 6th, average, book will get pretty good reviews because everyone who bought it knew what they were getting. If your 7th book happens to be excellent, hype will induce a lot of people who don't like your genre to buy it and see what everyone's talking about -- and they'll take it out on you in their reviews afterwards.